Move common libs to libs/common

libs/common/stevedore/tests/test_named.py

@@ -0,0 +1,93 @@
+#  Licensed under the Apache License, Version 2.0 (the "License"); you may
+#  not use this file except in compliance with the License. You may obtain
+#  a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#  License for the specific language governing permissions and limitations
+#  under the License.
+
+from stevedore import named
+from stevedore.tests import utils
+
+import mock
+
+
+class TestNamed(utils.TestCase):
+    def test_named(self):
+        em = named.NamedExtensionManager(
+            'stevedore.test.extension',
+            names=['t1'],
+            invoke_on_load=True,
+            invoke_args=('a',),
+            invoke_kwds={'b': 'B'},
+        )
+        actual = em.names()
+        self.assertEqual(actual, ['t1'])
+
+    def test_enabled_before_load(self):
+        # Set up the constructor for the FauxExtension to cause an
+        # AssertionError so the test fails if the class is instantiated,
+        # which should only happen if it is loaded before the name of the
+        # extension is compared against the names that should be loaded by
+        # the manager.
+        init_name = 'stevedore.tests.test_extension.FauxExtension.__init__'
+        with mock.patch(init_name) as m:
+            m.side_effect = AssertionError
+            em = named.NamedExtensionManager(
+                'stevedore.test.extension',
+                # Look for an extension that does not exist so the
+                # __init__ we mocked should never be invoked.
+                names=['no-such-extension'],
+                invoke_on_load=True,
+                invoke_args=('a',),
+                invoke_kwds={'b': 'B'},
+            )
+            actual = em.names()
+            self.assertEqual(actual, [])
+
+    def test_extensions_listed_in_name_order(self):
+        # Since we don't know the "natural" order of the extensions, run
+        # the test both ways: if the sorting is broken, one of them will
+        # fail
+        em = named.NamedExtensionManager(
+            'stevedore.test.extension',
+            names=['t1', 't2'],
+            name_order=True
+        )
+        actual = em.names()
+        self.assertEqual(actual, ['t1', 't2'])
+
+        em = named.NamedExtensionManager(
+            'stevedore.test.extension',
+            names=['t2', 't1'],
+            name_order=True
+        )
+        actual = em.names()
+        self.assertEqual(actual, ['t2', 't1'])
+
+    def test_load_fail_ignored_when_sorted(self):
+        em = named.NamedExtensionManager(
+            'stevedore.test.extension',
+            names=['e1', 't2', 'e2', 't1'],
+            name_order=True,
+            invoke_on_load=True,
+            invoke_args=('a',),
+            invoke_kwds={'b': 'B'},
+        )
+        actual = em.names()
+        self.assertEqual(['t2', 't1'], actual)
+
+        em = named.NamedExtensionManager(
+            'stevedore.test.extension',
+            names=['e1', 't1'],
+            name_order=False,
+            invoke_on_load=True,
+            invoke_args=('a',),
+            invoke_kwds={'b': 'B'},
+        )
+        actual = em.names()
+        self.assertEqual(['t1'], actual)